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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Kubernetes Custom Resources with Kubeless and Metacontroller</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="node_modules/reveal.js/css/reset.css">
<link rel="stylesheet" href="node_modules/reveal.js/css/reveal.css">
<link rel="stylesheet" href="node_modules/reveal.js/css/theme/black.css">
<link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,400i,600,600i" rel="stylesheet">
<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="node_modules/reveal.js/lib/css/monokai.css">
<meta name="description" content="Kubernetes offers a lot of basic resources to accomodate most application requirements but sometimes this is not enough. Kubernetes 1.7 introduced a new CustomResourceDefinition (CRD) resource to create your very own kubernetes resources. Although CRDs themselves are easy to use, they provide no way to define the actual logic behind the custom resource. For this the Metacontroller and Kubeless projects can be used, making the whole process a breeze.">
<meta name="author" content="Michael Gruener">
<link rel="author" href="mailto:[email protected]">
<meta property="og:title" content="Kubernetes Custom Resources with Kubeless and Metacontroller">
<meta property="og:type" content="article">
<meta property="og:description" content="Kubernetes offers a lot of basic resources to accomodate most application requirements but sometimes this is not enough. Kubernetes 1.7 introduced a new CustomResourceDefinition (CRD) resource to create your very own kubernetes resources. Although CRDs themselves are easy to use, they provide no way to define the actual logic behind the custom resource. For this the Metacontroller and Kubeless projects can be used, making the whole process a breeze.">
<meta property="og:url" content="https://github.com/bedag/kubeless-metacontroller-crd/index.html">
<meta property="article:author" content="https://github.com/mgruener">
<meta property="article:publisher" content="https://github.com/mgruener">
<meta property="article:published_time" content="2019-05-14T16:00:00+02:00">
<meta property="article:section" content="Talks">
<meta property="og:locale" content="en_GB">
<link rel="stylesheet" type="text/css" href="node_modules/asciinema-player/resources/public/css/asciinema-player.css" />
<style>
mark {background-color: #dc322f;}
</style>
</head>
<body>
<div class="reveal" .slide-number font-size="24pt">
<div class="slides">
<section data-markdown>
<script type="text/template">
# Kubernetes
# Custom Resources
# with Kubeless
# and Metacontroller
</script>
</section>
<section>
<img alt="bedag-logo" src="data/Bedag_Banner.png" style="background:none; border:none; box-shadow:none;"/>
Michael Grüner<br>
<img alt="bedag-map" src="data/map.png" style="background:none; border:none; box-shadow:none;"/>
</section>
<section data-markdown>
<script type="text/template">
The goal
--------
Our very own Kubernetes resource
<pre><code data-trim data-noescape class="shell">$ kubectl create myresource "foobar"
myresource "foobar" created
$ kubectl get myresource
NAME STATUS AGE
foobar Active 57s
</code></pre>
</script>
</section>
<section data-markdown>
<script type="text/template">
The recipe
----------
- A hint of resource definition
- Some logic to make it do something
- Some API magic to make it all stick together
</script>
</section>
<section>
<section data-markdown data-transition="slide-in none-out">
<script type="text/template">
A hint of resource definition
-----------------------------
CustomResourceDefinition
<pre><code data-trim data-noescape class="yaml">apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: myresources.stable.mycompany.com
spec:
group: stable.mycompany.com
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
kind: MyResource
plural: myresources
singular: myresource
shortNames:
- mr
</code></pre>
</script>
</section>
<section data-markdown data-transition="none-in none-out">
<script type="text/template">
A hint of resource definition
-----------------------------
CustomResourceDefinition
<pre><code data-trim data-noescape class="yaml">apiVersion: <mark>apiextensions.k8s.io</mark>/v1beta1
kind: CustomResourceDefinition
metadata:
name: myresources.stable.mycompany.com
spec:
group: stable.mycompany.com
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
kind: MyResource
plural: myresources
singular: myresource
shortNames:
- mr
</code></pre>
</script>
</section>
<section data-markdown data-transition="none-in none-out">
<script type="text/template">
A hint of resource definition
-----------------------------
CustomResourceDefinition
<pre><code data-trim data-noescape class="yaml">apiVersion: apiextensions.k8s.io/<mark>v1beta1</mark>
kind: CustomResourceDefinition
metadata:
name: myresources.stable.mycompany.com
spec:
group: stable.mycompany.com
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
kind: MyResource
plural: myresources
singular: myresource
shortNames:
- mr
</code></pre>
</script>
</section>
<section data-markdown data-transition="none-in none-out">
<script type="text/template">
A hint of resource definition
-----------------------------
CustomResourceDefinition
<pre><code data-trim data-noescape class="yaml">apiVersion: apiextensions.k8s.io/v1beta1
kind: <mark>CustomResourceDefinition</mark>
metadata:
name: myresources.stable.mycompany.com
spec:
group: stable.mycompany.com
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
kind: MyResource
plural: myresources
singular: myresource
shortNames:
- mr
</code></pre>
</script>
</section>
<section data-markdown data-transition="none-in none-out">
<script type="text/template">
A hint of resource definition
-----------------------------
CustomResourceDefinition
<pre><code data-trim data-noescape class="yaml">apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: myresources.<mark>stable.mycompany.com</mark>
spec:
group: <mark>stable.mycompany.com</mark>
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
kind: MyResource
plural: myresources
singular: myresource
shortNames:
- mr
</code></pre>
</script>
</section>
<section data-markdown data-transition="none-in none-out">
<script type="text/template">
A hint of resource definition
-----------------------------
CustomResourceDefinition
<pre><code data-trim data-noescape class="yaml">apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: myresources.stable.mycompany.com
spec:
group: stable.mycompany.com<mark>
versions:
- name: v1</mark>
served: true
storage: true
scope: Namespaced
names:
kind: MyResource
plural: myresources
singular: myresource
shortNames:
- mr
</code></pre>
</script>
</section>
<section data-markdown data-transition="none-in slide-out">
<script type="text/template">
A hint of resource definition
-----------------------------
CustomResourceDefinition
<pre><code data-trim data-noescape class="yaml">apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: <mark>myresources</mark>.stable.mycompany.com
spec:
group: stable.mycompany.com
versions:
- name: v1
served: true
storage: true
scope: Namespaced
names:
kind: <mark>MyResource</mark>
plural: myresources
singular: myresource
shortNames:
- mr
</code></pre>
</script>
</section>
<section>
<img alt="architecture-crd" src="data/overview/crd.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
</section>
<section>
<section>
<h2>Some logic to make it do something</h2>
<img alt="kubeless-logo" src="data/kubeless-white-test.svg" style="background:none; border:none; box-shadow:none;"/>
</section>
<section data-markdown data-transition="slide-in none-out">
<script type="text/template">
Some logic to make it do something
----------------------------------
Kubeless Functions
<div class="fragment">
<pre><code data-trim data-noescape class="yaml">apiVersion: kubeless.io/v1beta1
kind: Function
metadata:
name: hello-world
namespace: test<span class="fragment">
spec:
runtime: "python2.7"</span><span class="fragment">
handler: "helloget.foo"</span><span class="fragment">
checksum: "sha256:d251999dcbfde..."</span><span class="fragment">
function-content-type: "text"</span><span class="fragment">
function: |
def foo(event, context):
return "Hello {}".format(event['data']['world'])</span>
</code></pre>
</div>
</script>
</section>
<section data-markdown data-transition="none-in slide-out">
<script type="text/template">
Some logic to make it do something
----------------------------------
Kubeless Functions
<pre><code data-trim data-noescape class="yaml">apiVersion: kubeless.io/v1beta1
kind: Function
metadata:
name: hello-world
namespace: test
spec:
runtime: "python2.7"
handler: "helloget.foo"
checksum: "sha256:d251999dcbfde..."
function-content-type: "text"
function: |
def foo(<mark>event</mark>, context):
return "Hello {}".format(<mark>event['data']</mark>['world'])
</code></pre>
</script>
</section>
<section data-markdown>
<script type="text/template">
Some logic to make it do something
----------------------------------
Example function call
<pre><code data-trim data-noescape class="shell">$ curl -d '{"world": "Kubernetes!"}' \
> -H "Content-Type: application/json" \
> -X POST "http://hello-world.test:8080"
Hello Kubernetes!
</code></pre>
</script>
</section>
<section>
<img alt="architecture-crd-kubeless" src="data/overview/crd-kubeless.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
</section>
<section>
<section>
<h2>Some API magic to make it all stick together</h2>
<img alt="metacontroller" src="data/metacontroller.png" style="background:none; border:none; box-shadow:none; vertical-align:middle;" .element height="200" />
<span style="font-size:120px; vertical-align:middle; color:#326ce5;">
Metacontroller
</span>
(MaaS: Magic as a Service)
</section>
<section data-markdown data-transition="slide-in none-out">
<script type="text/template">
Some API magic to make it all stick together
--------------------------------------------
<div class="fragment">
<pre><code data-trim data-noescape class="yaml" style="max-height: 465px;">apiVersion: metacontroller.k8s.io/v1alpha1
kind: CompositeController
metadata:
name: hello-controller<span class="fragment">
spec:
parentResource:
apiVersion: stable.mycompany.com/v1
resource: myresources</span><span class="fragment">
childResources:
- apiVersion: v1
resource: pods
updateStrategy: { method: Recreate }</span><span class="fragment">
generateSelector: true</span><span class="fragment">
hooks:
sync:
webhook:
url: "http://hello-world.test:8080"</span>
</code></pre>
</div>
</script>
</section>
<section data-markdown data-transition="none-in slide-out">
<script type="text/template">
Some API magic to make it all stick together
--------------------------------------------
<pre><code data-trim data-noescape class="yaml" style="max-height: 465px;">apiVersion: metacontroller.k8s.io/v1alpha1
kind: CompositeController
metadata:
name: hello-controller
spec:<mark>
parentResource:</mark>
apiVersion: stable.mycompany.com/v1
resource: myresources
childResources:
- apiVersion: v1
resource: pods
updateStrategy: { method: Recreate }
generateSelector: true
hooks:
sync:<mark>
webhook:</mark>
url: "http://hello-world.test:8080"
</code></pre>
</script>
</section>
<section data-markdown>
<script type="text/template">
Some API magic to make it all stick together
--------------------------------------------
<div class="fragment">
<pre><code data-trim data-noescape class="json">{
"parent": {
"apiVersion": "stable.mycompany.com/v1",
"kind": "myresource",
...
},<span class="fragment">
"children": {
"Pod.v1": {...}
}
}</span>
</code></pre>
</div>
<div class="fragment">
<pre><code data-trim data-noescape class="json">{
"status": {},<span class="fragment">
"children": [
{"apiVersion": "v1", "kind": "pod" ...}
]
}</span>
</code></pre>
</div>
</script>
</section>
<section>
<img alt="architecture-crd-meta-kubeless" src="data/overview/crd-meta-kubeless.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
</section>
<section>
<section data-transition="slide-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/00-start.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/01-create-parent.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/02-notify-api.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/03-notify-meta.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/04-notify-function-01.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/04-notify-function-02.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/04-notify-function-03.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/05-return-api.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/06-create-resources.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
<section data-transition="none-in none-out">
<img alt="architecture-crd-meta-kubeless" src="data/process/07-loop.svg" style="background:white; border:none; box-shadow:none;"/>
</section>
</section>
<section><h2>Demo</h2></section>
<section>
<asciinema-player cols="200" rows="35" font-size="14px" src="data/demo.cast"></asciinema-player>
</section>
<section>
<h2>The End</h2>
Contact? Well...</br>
<ul>
<li>Github: <a href="https://github.com/mgruener">@mgruener</a></li>
<li>Github: <a href="https://github.com/bedag">@bedag</a></li>
</ul></br></br>
Anyone still using email? </br> <a href="mailto:[email protected]">[email protected]</a>
</section>
<section data-markdown>
<script type="text/template">
References
-------
* [https://metacontroller.app](https://metacontroller.app)
* [https://kubeless.io](https://kubeless.io)
* [https://github.com/bedag/kubeless-metacontroller-crd](https://github.com/bedag/kubeless-metacontroller-crd)
</script>
</section>
</div>
</div>
<script src="node_modules/reveal.js/js/reveal.js"></script>
<script src="node_modules/reveal.js/plugin/markdown/marked.js"></script>
<script src="node_modules/reveal.js/plugin/markdown/markdown.js"></script>
<script src="node_modules/reveal.js/plugin/notes/notes.js"></script>
<script src="node_modules/reveal.js/plugin/highlight/highlight.js"></script>
<script>
hljs.initHighlightingOnLoad()
</script>
<script>
// More info about config & dependencies:
// - https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
history: true,
slideNumber: true,
width: 960,
height: 700,
controlsTutorial: false
});
</script>
<script src="node_modules/asciinema-player/resources/public/js/asciinema-player.js"></script>
</body>
</html>